Dipyridyl quaternary salts



3,649,547 Patented Aug. 14, 1962 United States Patent Office EXAMPLE 2 3,049,547 DIPYREDYL QUATERNARY SALTS 2,2 -Dzpy-rzdyl Dz-Alpha-Pyrldylethyl Hydrogen Sulfate Francis E. Cislak, Indianapolis, Ind, assignor to Reilly A Tar & Chemical Corporation, lndianapolis, Had, a cor- 5 poration of Indiana I No Drawing. Filed May 31, 1961, Ser. No. 113,633

N 2HSO46 6 (Ilaims. (Cl. 26li294.8)

This invention relates to a new class of chemical comi L 3 pounds and to the process of making them. More partic- 10 N/ CH2 CHP ularly, it relates to dipyridyl quaternary salts, which compounds may be represented by the following general formula:

Thirty-two parts of 2,2-dipyridyl is dissolved in about 600 parts of methanol. This solution is cooled to about 5 C. and while being maintained at this temperature, 40

parts of concentrated sulfuric acid is slowly added. Then I while stirring the solution, 42 parts of Z-vinylpyridine is added and the mixture stirred for about three hours. Now

a; s9 most of the methanol, about 500 parts, is evaporated under OH; CH2 9 vacuum and the residue is cooled to about 10 C. and

\ allowed to stand overnight at this temperature. The 2,2-

Ofin CH2 dipyridyl di-alpha-pyridylethyl sulfate which crystallizes out, is separated from the mother liquor and washed with & R cold methanol. It is freely soluble in water, but is insoluble in hydrocarbons.

wherein R represents hydrogen or lower alkyl and A EXAMPLE 3 represents an inorganic acid anion. 2 B t h In general the compounds of my invention may be DlpflldylD f jj Alpha Pyudylerhyl] prepared by reacting a vinylpyridine, or a compound which upon dehydration is converted into a vinylpyridine, with a dipyridyl salt. It is advantageous to conduct the reaction in a solvent.

The compounds of this invention are useful as funga- 0235* cides, as ingredients in compositions for inhibiting the 'L To a solution of 32 parts of the dihydrobromide of 2,2- dipyridyl in 500 parts of methanol is added 30 parts of Z-vinyl-S-ethylpyridine. The mixture is stirred for several hours and then is allowed to stand overnight at about 5 EXAMPLE 1 C. The crystals of 2,2-dipyridyl-di-[beta'-ethyl-alpha- 4,4-Dipyridyl Di-Gamma-Pyridylelhyl Chloride pyridylethyl] bromide which crystallize from the solution action of dilute sulfuric acid upon steel, as insecticides, as CHiCH compounds of herbicidal compositions, as germicides, and as intermediates in organic syntheses.

My invention will be described more fully in connection with the following specific examples.

A solution of 23 parts of the dihydrochloride of 4,4- dipyridyl in 200 parts of methanol is prepared in any convenient manner. While stirring this solution, 21 parts of 4-vinylpyridine is slowly added. After all of the 4- vinylpyridine has been added, the stirring is continued for about one to two hours longer. The mixture is allowed to stand in a refrigerator (40 F.) overnight. During such standing, crystals of 4,4-dipyridyl di-gamma-pyridylethyl chloride crystallize from the solution. These crystals are separated from the mother liquor, as by filtration. The 4,4-dipyridyl di-gamma-pyridylethyl chloride thus obtained is fairly pure and can be used as such for many purposes, if however a greater purity is desired, the above obtained product may be recrystallized from any suitable solvent, as for example acetone. The product is freely soluble in water but is not soluble in hydrocarbon solvents.

If it is desired to prepare a halide other than the chloride, I need only start with corresponding dihydrohalide of 4,4'-dipyridy1.

are separated in any convenient manner, as by filtration. They are freely soluble in water, but are insoluble in hydrocarbon solvents such as benzene, toluene, or the like.

EXAMPLE 4 2,3-Dipyridyl-Di-Alpha-Pyridylethyl Chloride vinylpyrldine is used in place of 4-vinylpyridine.

3 EXAMPLE 5 4,4-Dipyridyl-Di-Gamma-Pyridylethyl Thiocyanate 4'; I claim as my invention: 1. The dipyridyl quaternary salts having the formula:

The procedure of Example 1 is employed with the exception that the dithiocyanate of 4,4-dipyridyl is used instead of the dihydrochloride.

EXAMPLE 6 2,2'-Dipyridyl Di-Gamma-Pyridylethyl Hydrogen Phosphate The procedure of Example 2 is employed With the exception that the di-hydrogen phosphate of 2,2-dipyridyl is used in place of the dihydrogen sulfate and 4-vinylpyridine is used in place of the 2-vinylpyridine.

C H: CH2

61 12 CH2 t l wherein R is a member of the group consisting of hydrogen and lower alkyl and A represents an inorganic acid anion.

2. The compound 4,4-dipyridy1 di-gamma-pyridylethyl halide.

3. The compound 2,2-dipyridyl di-alpha-pyridyl-ethyl hydrogen sulfate.

4. The compound 4,4-dipyridyldi-gamma-pyridylethyl thiocyanate.

5. The compound 2,2-dipyridyl-di-[beta-ethyl-alpha pyridylethyl] bromide.

6. The compound 2,2-dipyridyl di-gamma-pyridylethyl hydrogen phosphate.

No references cited. 

1. THE DIPRIDYL QUATERNARY SALTS HAVING THE FORMULA: 